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A Guide to Spark Plugs for the 2013-2022 Acura ILX

Keep your Acura ILX running smoothly by choosing the right spark plugs for your engine.

4 minutes to read 2013-2022 Acura ILX
Difficulty
1/5
Est. Time
1 hrs
DIY Doable?
✅ Yes
Shop Labor
$110-$161
⚠️ Drivable, but... — It is not wise to keep driving with a spark plug problem, as unburned fuel can enter the exhaust and damage the catalytic converter, leading to a much more expensive repair.
Key Takeaways
  • Always use high-quality Iridium spark plugs from OEM-equivalent brands like NGK or Denso for best performance and longevity.
  • Verify your engine size (2.0L or 2.4L) before purchasing, as they require different spark plugs.
  • Replace spark plugs when your Maintenance Minder shows code '4', typically around 100,000 miles.
  • Do not ignore a flashing check engine light or misfires, as this can lead to costly catalytic converter damage.
The spark plug in your Acura ILX is a small but essential part of the ignition system. It takes high-voltage electricity from the ignition coil and creates a tiny, powerful spark inside the engine's combustion chamber. This spark ignites the mixture of air and fuel, creating the controlled explosion that pushes the pistons and powers your car. Without a properly functioning set of spark plugs, your engine cannot start or run efficiently. Using the correct spark plugs ensures your ILX performs at its best, with optimal power and fuel economy.

Engine Differences Matter

Engine bay of an Acura ILX showing the 2.4L 4-cylinder engine layout.
The Acura ILX featured two different engines; the 2.4L (shown here) became the standard powerplant for the 2016-2022 model years.

Before buying spark plugs for your Acura ILX, you must know which engine you have. There were two main engines used between 2013 and 2022, and they use different spark plugs.

  • 2.0L 4-Cylinder Engine: Found in base models from 2013-2015.
  • 2.4L 4-Cylinder Engine: Found in performance models from 2013-2015 and as the standard engine in all models from 2016-2022.

Always confirm your engine size before purchasing to ensure you get the correct parts.

When to Replace Your Spark Plugs

Unlike older cars that needed frequent spark plug changes, your Acura ILX uses modern, long-life iridium spark plugs from the factory. The recommended replacement interval is not based on a simple mileage number but is indicated by your car's Maintenance Minder system. When your dashboard displays the code "4" (e.g., A4, B4), it is time to replace the spark plugs. This service is typically due around 100,000 to 105,000 miles.

Symptoms of Failing Spark Plugs

Comparison between a clean new iridium spark plug and a worn, fouled spark plug showing carbon deposits.
A healthy iridium spark plug (left) features a sharp center electrode, while a failed plug (right) shows heavy fouling and wear that causes misfires.

When spark plugs wear out, they can cause noticeable problems with your engine's performance. Common signs include:

  • Rough Idle: Your engine may shake or sound uneven when stopped.
  • Engine Misfires: You might feel a hesitation or stumble during acceleration as a cylinder fails to fire correctly.
  • Check Engine Light: A misfire will often trigger the check engine light, with codes like P0300, P0301, P0302, P0303, or P0304.
  • Reduced Fuel Economy: Worn plugs can cause inefficient combustion, making you fill up more often.
  • Poor Acceleration: The car may feel sluggish or slow to respond when you press the gas pedal.
  • Difficulty Starting: Worn plugs can make it harder for the engine to start, especially in cold weather.
    • 🎬 Watch: See these 5 signs of bad spark plugs in action.
Warning: Do not ignore engine misfires. Continuing to drive with a misfiring cylinder can send unburned fuel into the exhaust system, which can quickly damage the expensive catalytic converter.

Choosing the Right Aftermarket Spark Plugs

A set of premium NGK Laser Iridium spark plugs in their retail packaging.
For the Acura ILX, sticking with OEM-equivalent brands like NGK or Denso ensures the 100,000-mile longevity the factory intended.

For a precision-engineered car like the Acura ILX, the brand and type of spark plug you choose are important. The original factory plugs are high-quality Iridium units made by NGK or Denso.

Tier 1: OEM-Equivalent Brands

  • NGK & Denso: These are the original equipment manufacturers for Acura. Choosing NGK or Denso Iridium plugs is the safest bet to maintain factory performance, fuel economy, and longevity. In many cases, Honda (Acura's parent company) uses both brands interchangeably from the factory. You cannot go wrong with either choice.

Tier 2: Reputable Aftermarket Brands

  • Bosch: Bosch is a well-respected German parts manufacturer that produces high-quality Iridium and Double Platinum spark plugs. These are a solid alternative to NGK and Denso and can be trusted to perform well in the ILX engine.

Tier 3: Budget-Friendly Brands

  • Autolite & Champion: These brands offer more affordable spark plugs, including Iridium and Platinum options. However, owner reviews are mixed. While many have no issues, some users report premature failures or defects out of the box. For a modern, high-compression engine, it is generally recommended to spend a little more for the proven reliability of an OEM-equivalent brand.
Pro Tip: Modern iridium spark plugs come pre-gapped from the factory. It is not recommended to adjust the gap yourself, as the fine-wire center electrode is fragile and can be easily damaged. If you check the gap with a feeler gauge and it is incorrect, it is better to exchange the plug for a new one.

Cost of Replacing Acura ILX Spark Plugs

Category Estimated Cost
Shop Labor $110 - $161
New OEM Plugs (Set of 4) $100 - $145
New Aftermarket Plugs (Set of 4) $16 - $142
Total Professional Replacement $293 - $344

Frequently Asked Questions (FAQ)

The top of an Acura ILX engine with the ignition coils visible for spark plug access.
Accessing the spark plugs on the ILX is straightforward once the plastic engine cover and ignition coils are removed.
What's the difference between Iridium, Platinum, and Copper plugs?

The main difference is the material of the center electrode, which affects performance and lifespan. Iridium is the best, offering the longest life (100,000+ miles) and most consistent spark, which is why it's used in the ILX from the factory. Platinum is a good mid-grade option with a long life. Copper is the most basic, with a shorter lifespan (around 30,000 miles), and is not recommended for the ILX.

Can I install the spark plugs myself?

Yes, for someone with basic mechanical skills, this is a very feasible DIY job. It involves removing the plastic engine cover and the ignition coil for each cylinder to access the plugs. The job is straightforward on the 4-cylinder engine and can be completed in about an hour.

🎬 See this step-by-step spark plug and ignition coil replacement walkthrough.
Do I need to use anti-seize on the new spark plug threads?

It depends on the plug. Major manufacturers like NGK apply a special anti-corrosion plating to their plugs and specifically recommend NOT using anti-seize. Adding it can act as a lubricant, causing you to over-torque the plug and potentially damage the cylinder head. Always follow the plug manufacturer's instructions.

What are the OEM spark plug part numbers for my ILX?

For the 2.0L engine (2013-2015), the OEM part number is 12290-R41-L01, which is an NGK DILZKR7B11GS plug. For the 2.4L engine (2016-2022), the OEM part numbers are 12290-5A2-A01 (NGK) or 12290-5A2-A02 (Denso).

🎬 Watch: Tutorial for replacing spark plugs on the 2.4L engine.
Acura ILX 2.4L Spark Plug & Ignition Coil Replacement Change 2017 and Others Similar
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Acura ILX 2.4L Spark Plug & Ignition Coil Replacement Change 2017 and Others Similar
Acura ILX Spark Plug Replacement! Fast & EASY!
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Acura ILX Spark Plug Replacement! Fast & EASY!
5 Signs of Bad Spark Plugs
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5 Signs of Bad Spark Plugs
[Tutorial] 2013 - 2017 Honda Accord 2.4L K24W Earth Dreams Spark Plug Replacement
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[Tutorial] 2013 - 2017 Honda Accord 2.4L K24W Earth Dreams Spark Plug Replacement

Technical Specifications

OEM Part Numbers: 12290-R41-L01 (for 2.0L Engine) 12290-5A2-A01 (for 2.4L Engine, NGK) 12290-5A2-A02 (for 2.4L Engine, Denso)

Material: Iridium Gap (2.4L): 0.044 inches Socket Size (2.4L): 14mm

Wrenchy
Article researched & written by
Wrenchy
Go-Parts' AI research assistant. Every article is backed by live web research, verified OEM data, and real technician knowledge — so you get accurate, up-to-date information you can trust.
Meet Wrenchy → Updated Jun 1, 2026

The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.

Year Coverage
This article covers the Spark Plug for:
  • Acura ILX: 2013201420152016201720182019202020212022
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